Before they went Retina, iMacs could be used as displays in Target Display Mode. Is this possible with the new Touch Bar / USB-C MacBook Pros (late 2016) via the USB-C ports? They don't have a Mini DisplayPort-style Thunderbolt 1-2 port, and the support article about connecting various things to the USB-C ports doesn't mention an iMac. Neither does the article that explains what can and can't be used with the USB-C to Thunderbolt 2 adapter.
Macbook Pro Target Display – Using an iMac in Target Display Mode with USB-C MacBook Pro
imacmacbook protarget-displaytouch-bar
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Best Answer
Don't confuse a USB-C / Thunderbolt 3 port with USB only as the new MacBook Pro do have thunderbolt and not simply USB-C. The new MacBook Pro can output to a Mini DisplayPort target display mode compatible Mac with either a cable that connects directly or an adapter to the existing cable you would have used with the Mac.
I would probably go with a USB-C to MiniDisplayport and use the display port over USB-C protocol since that cable is less expensive than a thunderbolt adapter and would also work with a MacBook (non Pro and non Thunderbolt) or other USB only device. There's probably no speed benefit of thunderbolt for this application.
If you wanted thunderbolt - then you'd get Apple's Thunderbolt 3 to Thunderbolt 2 adapter - $30 on sale this month and use any standard thunderbolt cable. I used to believe all iMacs that support Target Display mode will take mini display port signal in - but some people report you need thunderbolt for some Macs. I have no reason to doubt them - so be sure you can return a DP cable if you buy one for this. Some iMacs support both thunderbolt as well as mini DP. Not all iMacs with either port support Target Display mode - especially the new 4k and 5k iMacs - they don't support any video input so you would need a software screen sharing solution for them.